1881609 has 8 divisors (see below), whose sum is σ = 2517120. Its totient is φ = 1250256.

The previous prime is 1881601. The next prime is 1881617. The reversal of 1881609 is 9061881.

It is an interprime number because it is at equal distance from previous prime (1881601) and next prime (1881617).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1881609 - 2³ = 1881601 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881609.

It is not an unprimeable number, because it can be changed into a prime (1881601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247 + ... + 1955.

It is an arithmetic number, because the mean of its divisors is an integer number (314640).

2^1881609 is an apocalyptic number.

It is an amenable number.

1881609 is a deficient number, since it is larger than the sum of its proper divisors (635511).

1881609 is a wasteful number, since it uses less digits than its factorization.

1881609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1881609 is about 1371.7175365213. The cubic root of 1881609 is about 123.4553155614.

The spelling of 1881609 in words is "one million, eight hundred eighty-one thousand, six hundred nine".